Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
Answers From Experts & Organizations (1) SUCCESS! A. The average American gets about 11 grams of fiber daily, much less than we need, according to the American Dietetic Association. Women should aim for 21 to 25 grams of fiber daily. Men should aim for 30 to 38 grams of fiber daily. The American Academy of Family Physicians recommends eating at least nine servings (four 1/2 cups) of fiber-filled fruits and vegetables each day, including apples, oranges, broccoli, berries, pears, peas, figs, carrots, and beans.